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Related Experiment Videos

Differential gene expression during early murine yolk sac development

J Palis1, P D Kingsley

  • 1University of Rochester, Department of Pediatrics, New York, USA.

Molecular Reproduction and Development
|September 1, 1995
PubMed
Summary

Researchers identified genes in the early mouse visceral yolk sac (VYS). The VYS endoderm showed liver-like functions, while the mesoderm remained undifferentiated, offering insights into early mammalian development.

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Area of Science:

  • Developmental Biology
  • Genomics
  • Molecular Biology

Background:

  • The visceral yolk sac (VYS) is crucial for early blood cell development, nutrition, and absorption in mammals.
  • Distinct tissues within the VYS, visceral endoderm and extraembryonic mesoderm, emerge during specific embryonic stages.

Purpose of the Study:

  • To identify genes differentially expressed in the developing murine visceral yolk sac (VYS) at early postimplantation stages.
  • To characterize the molecular differences between VYS mesoderm and VYS endoderm tissues.

Main Methods:

  • Utilized polymerase chain reaction (PCR) to generate cDNA from E7.5 murine VYS mesoderm and endoderm.
  • Employed differential screening to isolate VYS mesoderm-enriched and VYS endoderm-specific genes.
  • Confirmed gene expression patterns using in situ hybridization.

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Main Results:

  • Identified six mesoderm-enriched genes: ribosomal protein L13a, hsc 70, hsp 86, guanine-nucleotide binding protein-related gene, cellular nucleic acid binding protein, and alpha-enolase.
  • Identified one endoderm-specific gene: apolipoprotein C2.
  • Mesoderm-enriched genes were ubiquitously expressed in the embryo proper, while apolipoprotein C2 was confined to the VYS endoderm.

Conclusions:

  • PCR-based methods are effective for studying gene expression in small cell populations during early mammalian development.
  • At E7.5, the VYS endoderm exhibits differentiated, liver-like functions.
  • The extraembryonic mesoderm at E7.5 is largely undifferentiated, highlighting distinct developmental trajectories within the yolk sac.